Evaluation of the SafeR Mode in Patients With a Dual Chamber Pacemaker Indication (ANSWER)

Inclusion Criteria:

• Patient primo-implanted with a Symphony 2550 or Reply DR for less than 1 month according to the official guidelines.
• Patient implanted for sinus node dysfunction (including bradycardia-tachycardia syndrome) or 2nd, advanced or 3rd degree intermittent or allegedly permanent AV block.
• Patient implanted with a bipolar right atrial lead and a right ventricular lead
• Patient has signed a consent form after having received the appropriate information

Exclusion Criteria:

• Patient with permanent AF
• Patient suffering from sustained ventricular arrhythmias
• Patient with congenital complete heart block
• Patient with vasovagal syncope, carotid sinus syndrome
• Patient with AV node ablation
• Patient having suffered from a myocardial infarction within the last month
• Patient suffering from severe aortic stenosis
• Patient suffering from unstable angina pectoris
• Patient is not able to understand the study objectives and protocol or refuses to co-operate
• Patient is not available for scheduled follow-up
• Patient has a life expectancy less than one year
• Patient is included into another clinical study
• Patient is minor, this is < 18 years
• Patient is a pregnant woman
• Any patient with a contra-indication for the device labeling